Wig base



FIG. 1 is a top plan view of a wig base according to our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a right side view thereof, opposite left side view being mirror image thereof. 

CLAIM The ornamental design for a wig base, as shown and described. 